Sectional dry-dock.



l. L. CRANDALL.

SECTIONAL DRY DOCK. APPLICATION FILED Nov.26. 1911.

1,279,084. l Pandsept. I7,1918,

2 SHEETS-SHEET I.

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J. L. GRANDALL` SECTIONAL DRY DOCK. APPLICATION FILED NDV. 26, I911-Patented Sept. 17,1918.

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JAMES I.. CEANDALL, 0E EAST BOSTON, MASSACHUSETTS, ASSICNOH To THECEANDALE ENGINEERING COMPANY, 0E EAST EosToN, MASSACHUSETTS, ACCEPCEATICNCE MAINE.

SECTIONAL DEYDCCK. i

Specification of Letters atent. Y Patented Sept. 1 7', 1.918. Y

Application led November 26, 1917-. Serial No. 203,905.

`To all 'who-m t may concern Be it known that I, JAMES L. CRANDALL, a

citizen of the United States, and a resident of East Boston, county olESuiiolln'and State ofvldassachusetts, have invented an Improvement inSectional Dry-Dooks, of which the following is a specification.

My invention relates t0 sectional floating dry docks of the generalUstype, and has particular reference to means for rigidly securing thesections together to. form a unitary structure.

The object of my invention is the provisionof means whereby thecomponent sections of the floating dry dock may be rigidly securedtogether to form a unitary structure, and whereby an unequal stress inanyone section, or sections lmay be transmitted to otherA sections tothereby distribute and equalize the load Vupon each section. I The meanswhereby I accomplish the object of my invention is in the provision of atruss orf a sectionof a truss carried bythe float vportion of eachsection and preferably. arranged' within the side walls of each section,the members of which truss or part of truss have terminals extending'beyond the ends of the side walls of the sections, providing meanswhereby two adjacent sections may be rigidly united, whereby theseparate trusses or partsV of trusses may form a uni- 'tary trussextended the length of theentire united section, and whereby thestresses set f up in the members of any one truss section may betransferred to the members of other truss sections in the unitary truss.

Figure 1 isa plan View of a, sectional dry dock embodying my invention;

Fig. 2 is a side elevation of the same.

A Fig. 3 is an end elevation of a section.

Fig. 4 is an enlarged sectional elevation of a truss section as arrangedin the side Walls of the section, and the end connection between twoadjacent sections.

Fig. 5 is a partial plan jview ofl the end connection. l

Fig. 6 is a side elevationof a docksection with a. modified form oftruss.

As here shown, the floating dry dock comprises a number of sections 10,adapted to be placed in juxtaposition to form the unitary diy doekillustrated in Figs. 1 and 2. Each section may comprise the bottom orfloat portion 11 and side walls 12. Thebotbody or float 11 of thesection.

tom portion ofi the side walls may be made 1n any usual or convenientmanner.

The truss, with which my invention is iTEn STATES PATENT OFFICE* 1 iYconcerned, is ior may comprise the top hori-V zontal members 18, lowerhorizontal mem- 1 bers 14 and transverse members 15 connecting thehorizontal top andbottom members. The various members composing thetruss or section [of the truss may be formed of I l beams, or any othercustomary orfdesirable structural shapes.

The-top and bottom members 13 and 14" are provided with enlarged endterminal portions 16, to lwhich are secured the end connecting members.rIhe lend connecting members formed with flanges 17 and ex-y tended earsor lugs 18, are secured to the enlarged end terminals 16, and therebyform an integral part of the truss structure arranged, as here shown, inthe end. wall of the section. Y

As here shown, certain of the end connecting members are formed with oneex` Vtended ear` or lug 18 and others are formed lwith two extendedlugs,which are adapted to be placed in juxtaposition and secu-red together byapin 19v extended through holes or openings through said ears or lugs18, to thereby connect the top andv bottom members ot' the truss sectionwithin each section to form a unitary the sections.

Each trusssection may be integral with' structure extended between orseparatefrom the side wall of the section,

but is` adapted to be secured to the main When each truss section isconnectedA together through the end connecting terminals to formaunitary truss, it may be seen that, through such connection, thestresses in the members of any truss section will be Vtransfmembers ofother truss sections composing the united truss and that the docksections are'thereby rigidly united together to resistrelativedisplacement in a. vertical direction.

' 95 mitted, through the `terminal connection, to

Asfhere shown, that portion-of the truss forming the lower membercomprises two j vseparate beams 14, which are united by the endVrterminal portion or member 16. If one section is loaded unequally incomparison to a contiguous section, there will be a shearing 'stressexerted upon the pin connecting the truss members, `due to the tendencytoward wwalls, and tension members 2l are exten-dedA relativeverticalxmovement between the secl tions. With th'e provision of tworseparate .truss sections are united to form aunitary truss, serves torigidly unite the several dock sections, and the truss form may bemodified in many waysto suit the particular requirements of the designof floating dry dock..

Amodilied forniof truss is shown in Fig. 6, in which the top and bottommembers lY and 14 are maintained in spaced relation byV the vertical endstruts 20, which may bel incorporated in the end walls of the sidebetween the ends ofl the top and bottom members. Such laformi of trussis, to all purposes, equivalentto the truss above described,` and willperform the functions v equally well.

I claim: l. In afloating dry dock rality of independent dock sectionsadapted to be brought together to form thedry dock,

of a truss section carried by each doek section, the truss-sections ofvthe'independent docky sections being adapted. to be connectedtogether toform a unitary truss rigidly extended between thedoelt sections tothereby connect the'independent dock sections.l

2.' In a floating dry dock comprising a plurality of independent docksections adapted to be brought together to form the dryldoek, of a trusssection carried by each doek section, and means connecting members ofthe truss sections of the independent doek sections to form a unitarytruss ex-tended between the. united dock sections.

3.-' In a floating dry dock comprising a plurality of independent docksections eachV having a float portion and side walls, said independentsectionsadapted to be brought together to form the dry dock,l of a.truss section arranged within aside wall of each doch section,.the trusssections of the doelt sections adapted to be. united to form` a unitarytruss rigidly extended between theV united doek sections. 4f. Inafloating. dry dock comprisin-gaplurality of independent sections eachhaving a float portion and substantially vertical side Copies of thispatent may bev obtained forcom-prising a pluwalls, said independentsections y,adapted to 'libe brought together to foimthe dry doek, a

truss section arranged within the side Wall of each dock section andmeans arranged to connect members of each truss section o f theindependent Vdock sections to form a` unitary truss extended between theunited dock sections. c Y L 5. In a floating dry dock comprising aplurality of independent dock sections, a truss section lcarried by eachdock section, end terminal members carried :by members of said. trusssections arranged to be connected to Vunite thev dook sections and thetruss sections to form a unitary truss extended between the yunited doeksections.

6'. In a floating. dry dock comprising aV plurality of independentvsections adapted I to' be brought together to form the dry doelt, eachindependent dock section having a float portion anda truss wall portion,of means connecting. thetruss -portionshof said' doelt sections in theassembled positionvof said dock sections to forni a unitary'trussextended Vbetween the independent dock sec'- tions.- d'

7. A sectionaliffloating dry dock comprising a plurality of independentdock' sections,

each section having a float portionv and a truss wall portion, saidindependent sections being adapted to: be brought together to forin thedry dock, and'` means connecting said truss wall portions ofsaidindependent dock portions-in theV assembled condition of f said dockvportions to form a unitaryv truss wal-l extended between the assembledsections of the dry dock. v

8.. A sectional iifoating dry dooli.`V comprising a plurality ofindependent dock sections adaptedv to bey assembled to forma unitary.

dry' dock, said independent dock sections having a float portion andatruss portion',

said trussy portion having compression a-nd tension members extended thelength of 4its float portion,1 and means connecting the tension membersof the trussportions andthe compression members lof the truss portions'inthe assembled position of the dock sections to form a unitary trussextended be- 've cents` each, by' addressing thel Commissioner ofPatents:

Washington, n.03

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